diff --git a/R/electrolytes.R b/R/electrolytes.R
index c56e561..fc8a363 100644
--- a/R/electrolytes.R
+++ b/R/electrolytes.R
@@ -29,14 +29,3 @@ adjust_calcium_for_albumin <-
     (calcium + 0.025 * (normal_albumin - albumin)) %>%
       units::set_units("mmol1 l-1", mode = "standard")
   }
-
-# TODO effective osmolality
-# TODO glucose corrected sodium
-# TODO anion gap
-# TODO total body water
-# TODO fractional excretion of sodium
-# TODO transtubular potassium excretion
-# TODO free water deficit
-# TODO A-a gradient
-# TODO creatinine clearance (using urine)
-# TODO Framingham
diff --git a/README.md b/README.md
index 03e40f7..39442b9 100644
--- a/README.md
+++ b/README.md
@@ -63,3 +63,15 @@ remotes::install_github("ls31/clinicalr")
 ```r
 remotes::install_github("lc31/clinicalr")
 ```
+
+# To do
+* effective osmolality?
+* glucose corrected sodium?
+* anion gap?
+* total body water?
+* fractional excretion of sodium?
+* transtubular potassium excretion?
+* free water deficit?
+* A-a gradient?
+* creatinine clearance (using urine)?
+* Framingham?
diff --git a/docs/index.html b/docs/index.html
index 658a0e3..8cd8163 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -182,6 +182,22 @@ <h1 class="hasAnchor">
 <a href="#how-to-update" class="anchor"></a>How to update</h1>
 <div class="sourceCode" id="cb2"><pre class="downlit">
 <span class="fu">remotes</span><span class="fu">::</span><span class="fu"><a href="https://remotes.r-lib.org/reference/install_github.html">install_github</a></span><span class="op">(</span><span class="st">"lc31/clinicalr"</span><span class="op">)</span></pre></div>
+</div>
+<div id="to-do" class="section level1">
+<h1 class="hasAnchor">
+<a href="#to-do" class="anchor"></a>To do</h1>
+<ul>
+<li>effective osmolality?</li>
+<li>glucose corrected sodium?</li>
+<li>anion gap?</li>
+<li>total body water?</li>
+<li>fractional excretion of sodium?</li>
+<li>transtubular potassium excretion?</li>
+<li>free water deficit?</li>
+<li>A-a gradient?</li>
+<li>creatinine clearance (using urine)?</li>
+<li>Framingham?</li>
+</ul>
 </div>
 
   </div>
diff --git a/docs/pkgdown.yml b/docs/pkgdown.yml
index 10a9260..46eb26b 100644
--- a/docs/pkgdown.yml
+++ b/docs/pkgdown.yml
@@ -2,7 +2,7 @@ pandoc: 2.7.3
 pkgdown: 1.6.1
 pkgdown_sha: ~
 articles: {}
-last_built: 2020-11-04T11:25Z
+last_built: 2020-11-04T11:39Z
 urls:
   reference: https://ls31.github.io/clinicalr//reference
   article: https://ls31.github.io/clinicalr//articles